1266947449 has 4 divisors (see below), whose sum is σ = 1267047936. Its totient is φ = 1266846964.

The previous prime is 1266947419. The next prime is 1266947471. The reversal of 1266947449 is 9447496621.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9447496621 = 3767 ⋅2507963.

It is a cyclic number.

It is not a de Polignac number, because 1266947449 - 2¹¹ = 1266945401 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1266947396 and 1266947405.

It is not an unprimeable number, because it can be changed into a prime (1266947419) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28069 + ... + 57634.

It is an arithmetic number, because the mean of its divisors is an integer number (316761984).

Almost surely, 2^1266947449 is an apocalyptic number.

It is an amenable number.

1266947449 is a deficient number, since it is larger than the sum of its proper divisors (100487).

1266947449 is an equidigital number, since it uses as much as digits as its factorization.

1266947449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100486.

The product of its digits is 2612736, while the sum is 52.

The square root of 1266947449 is about 35594.2052727688. The cubic root of 1266947449 is about 1082.0637974986.

The spelling of 1266947449 in words is "one billion, two hundred sixty-six million, nine hundred forty-seven thousand, four hundred forty-nine".